@article{10_4064_fm_159_3_231_241,
     author = {R. Berr and F. Delon and J. Schmid},
     title = {Ordered fields and the ultrafilter theorem},
     journal = {Fundamenta Mathematicae},
     pages = {231--241},
     publisher = {mathdoc},
     volume = {159},
     number = {3},
     year = {1999},
     doi = {10.4064/fm-159-3-231-241},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-159-3-231-241/}
}